Improvement in printing-presses



a portion of said side view or elevation.

A'IENT OFFICE.

WILLIAM JOHNSON, OF LAMBERTVILLE, NEW .IERSEY.

IMPROVEMENT IN PRINTING-PRESSES.

Specification forming part of Letters Patent No. 128,731, dated J nly 9,1872.

Specification describing certain Improvements in Printing-Presses,invented by WM. JOHNSON, of Lambertville, in the county of Hunterdon andState of New Jersey.

inder which revolvescontinuously in the same direction, carrying thepaper upon its surface, cylinder being cut away to allow the type topass back without contact therewith after the impression has been madeand it consists, briefly, in the combination of eccentric gear ortoothed wheels for revolving, the cylinder with a gradually increasingand diminishing reciprocating movement of the bed, wherebya smooth,positive, andconnected motion of bed and cylinder is obtained.

In the accompanying drawing, Figure 1 is a Fig. 2 is an end or frontview. Fig. 3 is a plan view of parallel motion.

A is the frame, made in the usual manner. B is the impression-cylinder.O is the internal or toothed rim. D is a bevel-toothed wheel, into whicha bearin g or wrist-pin, U, is inserted. l? is a spur-pinion wheel incontact with the internal-toothed rim 0, revolving upon wristpin, U.Said spur-pinion has a hearing or wrist-pin, V, solidly attached, bymeans of which the bed is moved. E is a bevel-pinion wheel through whichmotion is communicated. F is the table carrying the type-form. H H arethe bearings or supports upon which the bed moves. 0 is a pinion-wheelupon the driving-shaft. M is a toothed spur-wheel driven by pinion O. LL are the eccentric toothed wheels, one of which is keyed fast tospurwheel M, and revolves therewith upon a stud, and in contact with theother eccentric-wheel upon the cylinder shaft. T is a shaft or journalfor bevel-wheel D. S is a hearing or support through which shaft 1passes. N is the driving-pulley.

Its operation is as follows: Motion being communicated to thedriving-shaft, the bed upon which the type-form rests is driven forwardunder the cylinder by means of the crankwheel, toothed rim, andspur-pinion, while the cylinder, having upon its outer surface the paperto be printed, is revolved upon its axis with a variable motion impartedthereto by the eccentric toothed wheels, so that that portion of thecylinders periphery in contact with the face of the type, and upon whichthe impres-' sion is made, conforms or corresponds accurately in motion.to the movement of the bed. After the impression has been made and thebed has reached the end of its forward stroke, it is then returned backin like manner, while the cylinder continues to revolve, discharging theprinted sheet and taking on another, repeating the operation as before,one revolution of the cylinder being made to one double or forward andback movement of the bed.

What I claim as my invention is 1. The combination of eccentric. toothedWheels L 'L, cylinder B, and reciprocatingbed F, for the purposesubstantially as described and set forth.

2. The eccentric gears L L, for giving a variable rotary movement to thecylinder, in combination with the toothed rim 0, pinion P, and theconnecting mechanism for giving a corresponding reciprocating movementto the bed, substantially as described.

WM. JOHNSON.

Witnesses:

CLARK PRESTON, J. HAYHURST.

